Table 2

Ultrasound synovitis and bone erosions in non-dactylitic versus dactylitic PsA: (A) including dactylitis affected digits and (B) excluding dactylitis affected digits

(A) US synovitis and erosionsNon-dactylitic PsA
(86/155 (55.5%) patients)
Dactylitic PsA
(69/155 (44.5%) patients)
Difference
Total GS ≥2 (joints)551/3422 (16.1%)642/2721 (23.6%)p<0.001
Total PD ≥1 (joints)114/3422 (3.3%)198/2721 (7.3%)p<0.001
Total GS ≥2+PD >1 (joints)89/3422 (2.6%)171/2721 (6.3%)p<0.001
Total US erosions (joints)15/3206 (0.5%)33/2557 (1.3%)p<0.001
Total erosion score (patient level)Mean 0.28 (SD 0.87), median 0 (0–0)Mean 0.72 (SD 1.63), median 0 (0–1)p=0.016
Total US erosive patients11/86 (12.8%)20/69 (29.0%)p=0.012
(B) US synovitis and erosionsNon-dactylitic PsA
(86/155 (55.5%)) (same as A)
Dactylitic PsA
(69/155 (44.5%)) (dactylitis excluded)
Difference
Total GS ≥2 (joints)551/3422 (16.1%)507/2466 (20.6%)p<0.001
Total PD ≥1 (joints)114/3422 (3.3%)126/2466 (5.1%)p<0.001
Total GS ≥2+PD >1 (joints)89/3422 (2.6%)101/2466 (4.1%)p=0.003
Total US erosions (joints)15/3206 (0.5%)24/2315 (1.1%)p=0.008
Total erosion score (patient level)Mean 0.28 (SD 0.87), median 0 (0–0)Mean 0.58 (SD 1.52), median 0 (0–1)p=0.048
Total US erosive patients11/86 (12.8%)18/69 (26.1%)p=0.035
  • GS, grey scale; PD, power Doppler; PsA, psoriatic arthritis.